I have used it several times with good results. I have also used B-12 Chemtool, and even just plain water. The Seafoam will smoke because of an ingredient it contains, but just about any fluid will clean up. Last weekend I had a session with water, acetone, and some cheap gas cleaner fluid I found at the Costco last time I was there. (This is in Japan) The water and acetone caused an emulsion, and the cleaner floated at the top. The car sucked through the acetone/water without smoke, but when it got to the cleaner it started smoking like Seafoam does. Let it suck most of the cleaner out of the glass jar. Shut off the engine, but the hose I used was long enough that because it was above the vacuum port I used, it kept sucking the fluid and dieseling for over a minute after I turned off the ignition. If you are gonna try it, make sure your hose is short, and that you keep the container lower than the vacuum port if possible. After I was finished, it was almost impossible to get the car to ping. It took a big hill, low rpms, and a lot of throttle.
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